I'm a monogamous knitter too at heart - although I'm currently suffering severe anxiety attacks because I currently have TWO projects on the needles
I like the simplicity of knowing exactly what I'm knitting and find the impatience to get an article finished so I can go onto the next one helps me to stay focused. I worry that I'll have centuries old UFO if I don't just keep going and get each one done one at a time.
However, having spent about a week knitting in seed stitch with very slippery cotton (making very slow progress! - and having reached the end of ball number 2!) - the pattern said "the back should measure 30cm". Unfortunately when I measured mine it was only 27cm :( I think this is because I'm using a different yarn to that recommended by the pattern and although I did do a tension swatch I think I was a little optimistic about it being exactly right because I was so anxious to use the wool I had bought!
So I frogged the lot and have started again on a bigger size of needles - I did another tension swatch and the length was more accurate on the larger needles so I've got my fingers crossed that when I get back to the point at which the back should measure 30cm it actually will. I think if it is still off I may just give up completely and find another pattern specifically written for my wool!
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